An overview of flow control in aerodynamic surfaces using vortex generators

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(3)

Published: March 1, 2025

Wind energy is a rare and valuable resource that can be efficiently harnessed using proper extraction mechanisms to interact with aerodynamic surfaces. It plays crucial role in lift increment through optimized geometry positioning of flow control devices. By introducing additional elements, such as devices, on their surfaces, it possible enhance the by delaying stall validation power enhancement This review paper aims provide detailed view vortex generator surfaces aircraft wings horizontal axis wind turbine blades lift/power increment, delay, effects performance. A achieves separation keeping attached boundary layer along under specified operating conditions. In this paper, various geometrical parameters profile, chordwise position, height, spacing between pairs, inclination surface, array configuration, computational turbulence model selection, user-defined functions, codes, scaled & complete analysis resultant effect performance are explained detail suitable schematics tables. design table created from voluminous research undertaken previous decades, intending seen reference for give collective idea operation generators effectiveness delay varied

Language: Английский

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Turbulent separation control with a tilted wavy wall: A promising approach for energy savings in aerodynamic systems

Energy, Journal Year: 2025, Volume and Issue: unknown, P. 135758 - 135758

Published: March 1, 2025

Language: Английский

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The groove effect on wake characteristics of rotating cylinders

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(7)

Published: July 1, 2024

In the present study, active and passive flow control methods have been implemented to investigate their effects on wake structures of a circular cylinder. Grooves having circular, rectangular, triangular cross sections applied cylinders exposed rotation rates, α, from 0 0.79. The experiments conducted by particle image velocimetry at Reynolds number Re = 5 × 103. contour graphics time-averaged results presented. Moreover, variations in velocity profiles also depicted. experimental revealed significant for patterns, structures, turbulence parameters due both groove geometries rotational motion. stationary cases, intensity, grooved cylinder exhibited 15% increase, while showed slightly higher increase around 20% compared that bare (BC). Conversely, non-stationary rectangular displayed most prominent reduction decreasing approximately 10% BC. type has considerably affected regions, especially lower rates.

Language: Английский

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Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Journal of Marine Science and Engineering, Journal Year: 2024, Volume and Issue: 12(5), P. 832 - 832

Published: May 16, 2024

To clarify the hydrodynamic interference characteristics of flows around multiple cylinders under wall effect, two-dimensional (2D) near-wall single, two tandem and parallel are simulated different gap ratios (0.15 ≤ G/D 3.0) spacing (1.5 T/D 4.0) at a Reynolds number Re = 6300. We also examine wake patterns, force coefficients, vortex-shedding frequency with emphases on effect effects two-cylinder interference. A critical 0.6 is identified in single-cylinder case where can exert significant influences. The exhibit three states: stretching mode, attachment impinging mode. coefficients upstream cylinder significantly affected by for 0.6. downstream mainly influenced cylinder. For > 0.6, similar variation trend. In arrangement, four states ranges: double hetero-vortex scale unilateral vortex free Moreover, or mode have synchronous in-phase state out-of-phase state. mean drag decrease, while lift opposite trends, as grows.

Language: Английский

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Wind Load Characterization Considering Three Container Cranes in Array Arrangement

IEEE Access, Journal Year: 2024, Volume and Issue: 12, P. 89222 - 89233

Published: Jan. 1, 2024

This study focuses on the wind characteristics of three container cranes discharged side-by-side under loads. Three-dimensional models were established using Computational Fluid Dynamics (CFD). The load pattern among was studied by adjusting parameters such as positional state arm cranes, angle, and spacing cranes. results show that maximum borne occurs at a 45° angle. At angle 90°, resistance effect optimal when between 45 m. Wind reduction approximately 63% in boom-up 58% boom-down arm. In addition, found critical 75 m When distance greater than m, gradually decreased until it disappeared. arm, is 60 change coefficient decreased.

Language: Английский

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Experimental investigation on energy conversion and vortex-induced vibration suppression of marine risers with turbine-type external devices

Energy, Journal Year: 2024, Volume and Issue: unknown, P. 134155 - 134155

Published: Dec. 1, 2024

Language: Английский

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